Question: What causes did John Walter held position on as the Member of the 15th Parliament of the United Kingdom?
Paraphrase: Which were the causes for which John Walter held a position while being a member of the 15th Parliament of the United Kingdom?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1702099 p:P39 ?s . ?s ps:P39 wd:Q41582555 . ?s pq:P1534 ?value}